The total length of Zhao Mengfu's "Ten Letters in Running Script" is 531.5 centimeters. Paper, ten letters. It was written casually by Zhao Mengfu, so the vertical and horizontal widths are different, and the brushwork is gentle. It has the rigorous structure of the Sui and Tang Dynasties, but overflows with the humor of the Jin Dynasty. There is a postscript at the end of the volume. After entering the Qing Dynasty, it was collected by Wang Hongxu, Pan Yanling, Luo Tianchi, Pei Jingfu, Wu Yuanhui and others. Now in the Shanghai Museum.